cahaya-agung/app/Models/StockProduct.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;

class StockProduct extends Model
{
    use HasFactory;

    protected $fillable = [
        'purchase_number',
        'sale_number',
        'qty',
        'product_number'
    ];

    public function product()
    {
        return $this->belongsTo(Product::class, 'product_number', 'number');
    }

    public function scopeFilter($query, array $filters)
    {
        $query->when($filters['search'] ?? null, function ($query, $search) {
            $query->whereHas('product', function ($query) use ($search) {
                $query->where('number', 'like', '%' . $search . '%')
                    ->orWhere('name', 'like', '%' . $search . '%');
            });
        });
    }
}